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<head>
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <link rel="stylesheet" href="./css/mi.css">
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<body>
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    <div class="header">
        <a href="#">
            <img src="./images/top.jpg" alt="ad">
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    <div class="black-nav">
        <div class="wrap">
            <!-- 实现居中 -->
            <ul>
                <li></li>
            </ul>
            <ul>
                <li></li>
            </ul>
        </div>
    </div>
    <!-- 黑色导航 end-->
</body>

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